Re: Rotary Spark Gap.
From: Joshua Resnick[SMTP:seraphim-at-WPI.EDU]
Sent: Wednesday, December 03, 1997 1:14 PM
To: Tesla List
Subject: Re: Rotary Spark Gap.
> It should be noted here, that non-syncronous RSGs are not recommended
> neon/obit powered coils. Since you have a non-syncronous motor, you
> should really save this until you get into higher power projects.
> sign transformer powered coils have been shown to work well and safely
> with syncronous gaps, which use motors that are synced to the AC line
> frequency at either 1800 ot 3600 rpm. The syncronous motor, once
> adjusted to the right phase, makes sure that there is always a chance
> a spark when the voltage on the cap is at maximum, saving your cap and
> Brass bolts or bullet nuts (like cap nuts) are often employed for
> electrodes. Also, Plexiglas is not an acceptable disc material since
> electrodes will melt it and fly off the disk at extreme speeds. An
> electrode in a 3000 rpm 1ft diameter disc will launch itself with a
> linear velocity of 100 MPH- dangerous!!! Safe coilers use 1/2" G10
> Fiberglass board for their rotary discs, and polycarbonate shielding
> (1/2" Lexan, which I've seen stop a .45 slug) around the disc.
Thanks for the plexiglass tip!
My transformers are not neons, they are series rated at 10kv -at- 300MA.